Add Activity.contentView property

[yanex]

Kotlin Slack/Gael Ribes:

/**
 * Gets the set content view of this Activity.
 */
val Activity.contentView: View?
    get() = (findViewById(android.R.id.content) as ViewGroup?)?.getChildAt(0)

[Ribesg]

/**
 * Gets the content view of this Activity if set, null otherwise.
 */
val Activity.contentView: View?
    get() = (findViewById(android.R.id.content) as ViewGroup?)?.getChildAt(0)

[damianpetla]

I would simplify this code to:

val Activity.contentView: View?
    get() = findOptional<ViewGroup>(android.R.id.content)?.getChildAt(0)